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Dynamic range DC1281A

Product Number: dc1281a

I'm using the DC1281A along with the DC890 evaluation board in order to measure a 5MHz 0-300mV sine wave with a 25MHz 1vpp clock signal.

In the Pscope software, I see a 5MHz square wave, not sine. All the points are either in "0" or in full scale.   

What is exactly the voltage range of this conversor or what can i be doing wrong?